Mondraker Sly RR: lightweight and precise performance e-MTB

The RR version is the top-of-the-line model in the Sly range, designed to offer the ultimate in performance and component quality. The aluminum frame is meticulously crafted, and the suspension setup is entrusted to Fox components: up front, we find the 160 mm Fox 36 Float Performance Grip fork, while at the rear, the Fox Float X Performance Evol 185x55 mm shock absorber works. The braking system and transmission are by Sram, a guarantee of efficiency and reliability. The 30 mm Mavic E-CrossTrail SL wheels complete the setup, offering an ideal balance between rigidity and comfort. The price is €6,999 . Below is the full test of the Sly RR.

The Alloy Stealth Evo 6061 frame is made with Mondraker's proprietary Stealth Alloy technology, designed to optimize the structural design, improving the weight-to-stiffness ratio. This construction process also allows for more precise welding, especially in the front triangle area. The cockpit features the Onoff S6 stem and the Onoff 800 mm aluminum handlebar , a combination that offers stability and excellent steering sensitivity, especially on faster descents. The Onoff Pija dropper seatpost, with 1X remote and internal bearing, has a diameter of 31.6 mm and is paired with the 145 mm Fizik Terra Aidon X5 saddle, designed to ensure comfort and support even on the most technical sections.

The frame is available in five sizes S 380 mm, M 410 mm, ML 435 mm, L 460 mm, XL 490 mm, and is designed with Forward Geometry technology, one of the most distinctive solutions developed by Mondraker, which includes longer reach and head tube, wider front center, short stem, longer wheelbase and reduced fork offset , a combination of technical and design elements present on all Mondraker bikes that improves stability, control and precision in every situation, making riding more intuitive and safe for every type of rider.

The Mondraker Sly RR is equipped with the Zero Suspension System : it is a virtual pivot point suspension system, based on an exclusive double link design, whose most distinctive feature is the "floating" shock absorber, positioned between the two linkages and compressed at both ends, a configuration that makes the rear suspension extremely sensitive to small bumps and at the same time capable of effectively managing even the most intense impacts, offering a smooth and controlled response in every situation, and it is precisely this quality that makes every full suspension mountain bike by Mondraker immediately recognisable and surprising.

The Sly RR's suspension setup is handled by an all-Fox setup. Up front, we find the high-performance 160mm Fox 36 Float Performance Grip , with 36mm stanchions, 44mm offset, a Boost 15x110mm mount, and a tapered head tube. It offers three adjustment positions (open, mid, and locked), along with low-speed compression, rebound, and air preload controls, for precise customization based on terrain and riding style.

The rear end features the Fox Float X Performance Evol , with a 185x55 mm wheelbase, trunnion upper mount, and 30x8 mm lower bushings. There's plenty of adjustment here, too: two-position compression (open/locked), rebound, and air preload, to ensure a progressive and always well-controlled response even in the most demanding situations. A combo that focuses on control, sensitivity, and reliability both on the descents and the climbs.

The Mondraker Sly RR features the Bosch Performance Line SX motor, electronically limited to 25 km/h but capable of delivering 60 Nm of torque. Power is provided by an integrated 400 Wh Bosch Compact Powertube battery , which offers a decent range: in a real-world test, it was possible to travel 58 km with 1,200 meters of altitude difference with an 18% charge remaining. The cyclist can activate and control the electric motor via the System Controller and the Purion 400 display. The System Controller, integrated into the top tube, includes the on/off button for the Bosch Performance Line Sx electric motor and four LEDs that indicate the battery's range and the selected assistance mode.

The Bosch mini remote controller is installed on the left side of the handlebar, allowing the rider to manage the main motor functions without taking their hands off the handlebars to consult the System Controller located on the top tube. Finally, the Bosch Purion 400 display is located on the right side of the handlebar, providing all the information on the battery, speed, time, kilometers traveled, and assistance mode. The rider also has the option of managing the main functions of the Bosch Performance Line SX through the eBike Flow app.

The Mondraker Sly RR is equipped with Mavic e-Crosstrail SL wheels, which weigh a combined 1,975 grams for the pair. The 30mm aluminum rims incorporate patented Fore and PFP technologies, giving these e-MTB wheels exceptional durability, making them virtually indestructible. The 28-hole drilling pattern, both front and rear, uses Fore tapeless tubeless technology, designed to ensure optimal grip without inner tubes.

The tires fitted are Maxxis Minion Dhf 29x2.5 WT , tubeless ready, made with 3C Maxx Gripper compound to ensure superior grip. Equipped with Exo+ protection and a folding bead, they offer a 60 Tpi casing that guarantees strength and flexibility. The braking system is entrusted to Sram Code Bronze Stealth levers, while both front and rear are fitted with Sram Code Bronze Stealth brakes with oversized four-piston calipers. The brake rotors are one-piece 200 mm Centerline discs with six IS bolts, and the pads are made of sintered metal with a steel support, guaranteeing power and durability even in the most demanding conditions.

The Mondraker Sly RR features the Sram Eagle AXS 12-speed electronic groupset , a cutting-edge solution that guarantees quick and precise shifts. The 34-tooth Sram X-Sync 2 Eagle crankset is paired with 160 mm cranks, while the Sram Eagle AXS Pod MMX 12-speed electronic shift levers are positioned on the right side of the handlebars for immediate and intuitive access. The Sram Gx Eagle AXS T-Type 12-speed rear derailleur works in perfect synergy with the Sram Xs-1275 10-52T T-Type cassette and the Sram GX Eagle T-Type chain, ensuring smooth and reliable transmission on any terrain.

The Mondraker Sly RR immediately surprises with its lightness, weighing just 20.7 kg without pedals, which, in the Bosch full-suspension e-MTB segment, represents an absolutely remarkable result. This translates into superior handling and dynamic response, especially when tackling challenging technical sections such as jumps, scree slopes, and narrow passages. The combination of the Stealth Alloy aluminum frame , Forward Geometry, and Mondraker's refined Zero Suspension System deliver a smooth, precise, and intuitive ride, capable of effectively absorbing bumps while maintaining extraordinary sensitivity to the smallest details of the terrain.

On the descents, the Sly RR feels extremely safe and stable, with the 160mm Fox 36 Float Performance Grip fork and Fox Float X Performance Evol shock absorber working in perfect synergy to offer total control, even on the roughest and steepest terrain. The stiff yet lightweight frame allows for quick changes of direction without losing your line, while the SRAM Eagle AXS electronic drivetrain ensures instant and precise gear changes, ideal for maintaining the right thrust in any situation. However, the small size of the 400Wh Bosch Compact Powertube battery means a shorter range than other e-MTBs with larger capacity batteries: in a realistic test, we managed to cover approximately 58km with 1,200m of elevation gain, a fair figure but one that requires careful management of the electric assistance, especially on longer or more challenging routes.

This aspect may represent a limitation for those seeking an extended range without compromise, but it is compensated for by the quality and dynamic riding behavior that make the Sly RR an e-MTB dedicated to pure performance. In short, the Mondraker Sly RR excels at transmitting a feeling of control and safety to the rider, with the responsiveness of a true traditional mountain bike, enhanced by well-calibrated electric support. It is the ideal choice for those looking for a lightweight and high-performance e-MTB, capable of enhancing technical and aggressive riding, but accepting a more limited range than models with larger batteries.

Below are the pros and cons of the Mondraker Sly RR.

Pros: Lightweight and stiff Stealth Alloy frame (20.7 kg without pedals); Forward Geometry for improved stability and control; very sensitive and responsive Zero Suspension System; high-quality components from Fox, SRAM, and Mavic; precise and fast SRAM Eagle AXS 12-speed electronic drivetrain; powerful and reliable braking system with SRAM brakes; the Bosch Performance Line SX motor is powerful and smooth in its assistance management; good quality/price ratio.

Cons: The 400 Wh battery has a rather limited range. While lightweight for an e-MTB, the Sly RR is still heavier than traditional mountain bikes, which can be a problem on technical unassisted climbs or when carrying.